Blast-flame furnace.



PATENTED MAY 29, 1906 B. E. ELDRED. BLAST FLAME F URNAOE.

APPLICATION FILED APR.14, 1905.

WITNESSES: z.

ATTORNEYS UNITED STATES PATENT OFFICE.

BYRON ELDR D, or BRONXVILLE, NEW YORK, Assienoa'r'o COM-' BUSTIONUTILITIES COMPANY, OF NEW YORK, N. Y A CORPORA= TION OF NEW YORK.

BLAST-FLAME FURNACE.

.To a, whom it may mm;-

Be it known that I, BYRON E. EL'DRED, a

citizen of the United States, residing at- Bronxville, in the. countyofWestchester and State of New York, have invented certain new and usefulImprovements; in Blast- Flame Furnaces, of which. the following secification and accompanying drawings ilustrate the invention in a formwhich I now regard as the best out' of the various forms-in which it maybe embodied.

This invention relates to,furnaces or kilns for performing calcining,roasting, cintering,

for the main flame which occupies the and similar operations .uponmaterials, and more especial y to vfurnaces, such as rotary furnaces;for making Portland-cement clinkers. 4

.The object of the' invention to provide an apparatus for obtaining inthe kiln a'plu-' rality of distinct regions of diiierenttemperature'that is, referabl a regionof moderate temperature orcalcining the 'cementma'terial and a region of'higher temperature forfinally fusing. the clinke'rs.- This object is performed, preferably, byem l'o. a blastflame, such as the ordinary po wd ered-coal blast,'or, ifdesired, a modifi'edblast-flame body of the kiln-chamber andaccomplishes the-calcining or'the calcln ng'and more or less of thecintering operation, and for the final cintering or fusionof theolinkers making use of an auxiliary high-pressure aseous jet directedtransversely of the main" last andaflecting a ortion onlyof theblast-current, whereby a ocal current of flame is driven against thematerial, producing a local temperature. This auxiliary, jet mayconveniently 'be acompressed-air jet, and for the purpose of alteringits direction or, the intenslty of its efiect I Specification ofLetterelatent.

- Application filed April 14, 1905. R Serial No. 255,662

manner,

- material. known wa 797,506 was grantedAu Fig. 4 is a'nenlargedPatented May 29, 1906.

i 10 is the inclined rotary barrel or working chamber of the kiln with astack 11 at thehigher end and a conveyer 12 for introducing the materialto the barrelat that end, a removable head 13 at the lower end, ablastnozzle 14 supported thereon and'directed nearly axial withthe'barrel, .a receptacleor bin 15 forthe powdered .coa'l, together w1thfor feeding the coal to 16 connected the rear of suitable mechamsm theblast-nozzle, and a pipe with a fan-blower 29 and entering the nozzlefor furnishing.,,the blastressure and more orless of .the air tor comustion.

These parts may all beof the usual construetion and mode of operation.reason, however, of the'provisio'n of auxlhary means for creating a highlocal cintering tem era ture, as hereinafter described, the main amemay, if desired, be modified In a su table so as to have less than itsusual 1n-' tensity of heating" effect upon the cement This may be done1n'any'well-- or .by means of diluent stackgases, as escribed in acopending'applica 1 tion, Serial No. 57 4,47 4, on'which Patent No.

@115, 1905, Above the blast-n'ozz e 14 an auxiliary nozzle 18 is mountedon a pivot 19 and-connected by a branch pipe 20, having a flexiblesection, with an-air-compressor .17, whereby a high-pressure jet of airisdellvered against the main blast. This nozzle is directed downwardlytoward the floor of the barrel 10 at an angle to the axis of theblast-nozzle, which angle may be changed by moving the auxiliary nozzleon its pivot. To regulate the pressure of the auxiliary et, a valve 21is shown in the branch pipe 29, having amovable pointer 22 and fixedIndex 23, and a ressure-gage 24 is shown connected with the ranch 'ipefor indicating th s pressure. Surrounding the nozzle 18 1s a concentrlcnozzle 30, connected by a pipe 31, havinga flexible section, with asecond fan-blower 32, for furnishing a larger volume of alr'at a lowerpressure to the auxiliary et. By-ad- .justing the quantities deliveredby the comressor and the fan,

der the conditions of use,

i In the base of the stack is an opening proalong the bottomto thedis'char vided with a damper 25, which is operatedby a lever 26 fromnear the discharge end of the kiln, whereby the center of the main flamemay with ease be moyed longitudinally to and fro in the kiln. 'Openingthis damper 'movesthe flame back toward the discharge end and closing itmoves'it forward toward the stack. A amper 27 on top of the stack isalso shown.

In operation the material is fed to the rotary barrel glO by conveyer12'andproceeds usefulresult is secured in the way of less destructlveeflect upon the lining of the barrel,

as well as a more efficient and economical apgllicatlon of the heatenergy of the fuel. 1 The alhigh temperature required for the fusion orcintering of the cement clinkers'is furm'shed through the agency of theauxiliary jet delivered through nozzles 18 30 and actmg upon a portiononly ofthe main blast-current, such portion being deflected down wardlyupon the floor of'the barrel near its discharge end and roducing byagitation and concentration of t e combustlon a localized high temerature, which makes a hard satisfactory c inker. The temperatures arethus under better control than heretofore and the heating agent moreefiectively applied.

Burning out of the lining by the cinteringflame can be minimized andavoided by the control exercisedover the direction of the flame, thislocal flame being directed upon a portion of the floor of thebarrelwhich is covered by cement material;

I am enabled to employ the auxiliary jet in conjunction with theordinary apparatus for supplying blast-flames for cement burnmg andanalogous purposes, such as the powdered-coal blast, and to securebetter clinker, better control of combustion, and greater economy offuel than has heretofore been 'attame It will beseen that the tworegions of combustion are adjustable relatively to each other and eachinde endently adjustable longitud-inally of the kiln, the auxiliaryflame by thepivotal movement of nozzles 18 30 and the main flame,whichis more subject to the draft in the kiln, by adjustlmg either of the damers '25 27.

at I claim 'as new, and desire to secure I by Letters Patent, is Y 1- Afurnace comprising a combustionchamber having .means for feedingmaterial .auxiliary nozz e-chute 28 v in the cement-forming material,and it may,

for independently adjustin along its floor, a blast-nozzle forprojecting a flame over the material in the opposite direction to thetravel of thematerial, fuel and blast-current connections to saidnozzle, an auxiliary nozzledirected at an angle to the axis of theblast-nozzle toward the floor of v the combustiomchamber and commandinga portion of the blast-current, means for supplying a highressuregaseous fluid to sald i; and means forv supplymg a low-pressure gaseousfluid thereto.

2. A furnace com rising acombustion chamber, a blast-nozzle directedthereinto, a receptacle for powdered'coal connectedwith said nozzle,means to sup 1y a blast-current through said nozzle, an an auxiliaryjetnozzle commanding a ortion of the blast and'directed at an an lie tothe axis of the blast-nozzle, said nozz e comprisin concentric pipesconnected to different flui sources.

3, furnace comprising a rotary lncllned barrel, material-supplying meansat the higher end thereof, a discharge-outlet at the lower end, ablast-nozzle directed into-said barrel substantially axial therewith,and an auxiliary nozzle directed across the axis of said nozzle towardthe floor of the barrel, said nozzle comprising concentric pipesconnected to diflerent'fluid sources.

4. A furnace comprising a combustionchamber, means for producing regions.of combustion of different intens tiestherein,

and means forrelatively adjusting said re- W gions longitudinally of thefurnace.

5. A furnace comprising a combustionchamber, means for roducing-a maincombustion of relatively owtem erature therein, means for producing'aloca 'combustion of higher temperature, means for adjusting one of saidcombustions relatively to the other and means for adjusting both,longitudinally of saii chamber.

furnace comprising a combustionchamber, means for producm a main flameand an auxiliary flamev therein, and means both of said flameslongitudinally of the ,c amber.

7: A- furnace comprisin chamber having means for feeding the mate rialtherethrough, a blast-nozzle at one end thereof -for supplying a mainaxial flame, means for supplying a local high-temperature acombustionflame in contact wlth the materials near the discharge end,and means'for relatively ads? justing said flames longitudinally' ofsaidv kilns. 1

g 8. A furnace] comprising a combustionchamber havin a stack at one end,ablastsaid nozzle for producing a local high temperature at the nozzleend,-and damper mechanism at the stack end for varying the position ofthe main-nozzle flame within the combustion-chamber. i 1

9. A furnace comprising a combustionnozzle at theot or end, meansadditional to chamber having a stack at one end, a blastchamber, a mainblast-nozzle, an auxiliary nozzle at theother end,'an auxiliary nozzledeflecting-nozzle having outer and inner for producin' a local flame,said nozzle adpipes, an air-compressor connected with the 15 justabie ind ireotion, and damper mechan inner pipe, and a fan-blower connectedwith 5. ism for varying the position of the' main the outer pipe.-flame. In testimony whereof I have hereunto set 10. A furnace comprisinga combustionmy hand, in the presence of two subscribing chamber, a, mainblast-nozzle, an auxiliary Witnesses, the-8th day of April, 1905.deflecting-nozzle having two pipes, and BYRON E. ELDRED.

10 means for supplying fluids of different pres- Witnesses:

sures through the respective pipes. JA's. D. GRANT,

1 1. Afur'nace comprising a. combustionv CARLETON ELLIS.

